Abstract: An air-deflecting arrangement in a motor vehicle for maintaining a predetermined portion of a side window in a door of said motor vehicle substantially clear and unobscured from airborne road dust, said motor vehicle door having a bodywork portion located adjacent a forward edge of said side window and a rear-view mirror mounted on said door so as to be readily visible to an occupant of the vehicle through said predetermined portion of said side window, said air-deflecting arrangement comprising an air-deflecting edge member extending substantially vertically along said bodywork portion and adjacent said forward edge of said side window, said air-deflecting edge member being formed with a smoothly curved lip portion extending away from said side window such that, when the vehicle is in forward motion, the air stream passing said side window is deflected away from said predetermined portion and thus substantially prevented from depositing thereon any road dust and water entrained in said air stream.